/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

package action;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

/**
 *
 * @author sally
 */
public class talkServlet extends HttpServlet {

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
	    throws ServletException, IOException {
	response.setContentType("text/html;charset=UTF-8");
	PrintWriter out = response.getWriter();
	try {
	    /* TODO output your page here. You may use following sample code. */
	    out.println("<!DOCTYPE html>");
	    out.println("<html>");
	    out.println("<head>");
	    out.println("<title>Servlet talkServlet</title>");	    
	    out.println("</head>");
	    out.println("<body>");
	    out.println("<h1>Servlet talkServlet at " + request.getContextPath() + "</h1>");
	    out.println("</body>");
	    out.println("</html>");
	} finally {
	    out.close();
	}
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
	    throws ServletException, IOException {
	//processRequest(request, response);
	String user=request.getParameter("user");
	HttpSession session=request.getSession();
	session.setAttribute("user",user);
	ServletContext sc = request.getServletContext();
	RequestDispatcher rd=sc.getRequestDispatcher ("/talk2.jsp") ;
	rd.forward(request,response);
	
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
	    throws ServletException, IOException {
	request.setCharacterEncoding("UTF-8");    //指定中文編碼，但要置於String mes前
	String mes=request.getParameter("mes");
	//mes=new String(mes.getBytes("ISO8859_1"),"UTF-8");
	HttpSession session=request.getSession( );
	String user=(String)session.getAttribute("user");
	//ArrayList list=new ArrayList( );
	ServletContext sc = request.getServletContext();
	ArrayList list=(ArrayList)sc.getAttribute("list");
	if(list==null){
	    list=new ArrayList( );
	    sc.setAttribute("list", list);
	}
	
	list.add(user+":"+mes);
	RequestDispatcher rd=sc.getRequestDispatcher ("/talk3.jsp") ;
	rd.forward(request,response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
	return "Short description";
    }// </editor-fold>

}
